JP3050322B2 - Data equivalent method and computer system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data equalization method and a computer system, and more particularly to a data equalization method in which all data is given from a service system to a standby system at the time of standby switching to equalize both data. The present invention relates to a method and a multiplexed computer system for realizing this equivalent method.

[Prior Art] In an online type data processing system, two computers are provided in order to ensure reliability and continuity of operation, and one computer is used as a normal system and the other computer is used as a standby system. A computer system having a redundant configuration is employed. Such a computer system may duplicate not only the computer but also the database from the viewpoint of reliability. In such a duplicated computer system, it is necessary to make the standby database equivalent to the regular database. While the computer is operating in the standby system,
By transferring all the input data of the regular system to the standby system,
The equivalence of both databases is guaranteed. However, when one computer shifts from standby to standby system, or when the computer shifts from offline to standby system, transfer a large amount of database, especially history data for a specified period, to / from a regular computer. And do database equivalence.

[Problems to be solved by the invention]

In the above-described data equalization method in the conventional computer system, while the history data is transferred from the service system immediately after the standby system starts up, if the history data collection / update process is executed in the service system, the standby system There is a problem that continuity of history data is lost. Further, if the process of transferring the history data to the standby system is prioritized, the collection process of the history data in the service system is delayed, and there is a disadvantage that data at a fixed period or at a specified time cannot be collected.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a data equalization method and a computer system which can make the databases of the standby system and the service system equivalent and can collect the history data.

[Means for solving the problem]

According to the first aspect of the present invention, a plurality of calculation processing devices for processing the database are provided, and at least one of the calculation processing devices is used as a regular system to periodically execute a history data collection / storage process, and to execute the other calculation processing devices. In the data equalization method for keeping the contents of the database of each computer processing device equivalent in the computer system in which the computer is executed as a standby system, (a) the calculation processing device that has started up from the stop or offline to the standby system has to perform the calculation of the normal system. The processor requests the transfer of the system information to be the standby system and also requests the transfer of the history data. (B) In the service processor, when the transfer request of the system information to be the standby system is made, the request is sent to the request destination. This system information is transferred, a history data transfer request is set, and collection and storage of history data for the normal system is completed. When a history data transfer request is set at this time, this history data is read from the database, and if the amount is transferable by the time the next history data collection and storage processing is performed, it is sent to the request destination at once. If the amount exceeds the transferable amount, the history data is divided and transmitted every time the collection and storage of the history data is completed.

In other words, according to the first aspect of the present invention, the computing device that has started up from standby or offline to the standby system requests the standby system processing device to transfer the system information to be the standby system and also issues the transfer request of the history data. When the request is made, the service processor of the service system transfers the system information of the standby system when the request is made, and utilizes the timing at which the collection and storage of the history data of the service system is completed, using the requested history data. Is sent to the calculation processing device that has started up in the standby system of the request destination. If the requested history data is large and the transfer processing is not completed within the time from the collection and storage of the history data to the next similar processing, the transfer processing is divided and each time the collection and storage of the history data is completed. The transfer process is to be performed.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a computer system for realizing the data equivalent method of the present invention.

The computer system shown in FIG. 1 includes computing devices 1 and 2 and history databases 3 and 4 that are controlled by the computing devices 1 and 2 such as updating.

The computing device 1 includes a processing unit 10 for monitoring and controlling history data processing and communication, and a system state, and a setting unit 11 for setting a history data transfer request.

Here, the processing unit 10 includes a history data processing unit 10a for collecting history data and updating the history data, a system status monitoring control unit 10b for monitoring the status of the entire system and controlling the operation, and a computing device 2 And a communication management unit 10c that communicates with the server.

The setting unit 11 includes a history data request flag used when requesting the transfer of the history data.

The computing device 2 includes processing means 20 for processing and managing history data and monitoring and controlling the state of the system, and setting means 21 for setting a history data transfer request.

Here, the processing unit 20 includes a history data processing unit 20a that performs a history data collection process and a history data update, a system state monitoring control unit 20c that monitors the state of the entire system and controls the operation, And a communication management unit 20c for communicating with the communication management unit 20c.

The setting unit 21 includes a history data request flag used when requesting the transfer of the history data.

One of these computing devices 1 and 2 operates as a regular system, and the other operates as a standby system. In addition, the computing devices 1 and 2 can mutually transfer data by connecting the communication management units 10c and 20c via the line 5.

A data equalization method realized by the computer system having such a configuration will be described with reference to FIG.

Steps shown in FIG. 2 are the processing flow in the computing device 1, and the operation when the computing device 1 shifts from the stop to the standby system or when the computing device 1 shifts from offline to the standby system will be described. Is what you do.

Steps shown in FIG. 2 are the flow of processing performed by the computing device 2, and illustrate the operation when the computing device 2 operates in a normal system.

When the computer 1 of the computer system shifts to the standby system, first, the system state monitoring control unit 10b performs a startup process (step), and becomes the standby system for the computer 2 via the communication management unit 10c. Issue a transfer request for system information necessary for the operation (step).

When the communication management unit 20c receives the transfer request (step), the computing device 2 transmits the transfer request from the communication management unit 20c to the system status monitoring control unit 20d. The system state monitoring control unit 20b communicates with the computing device 2 via the communication management unit 20c.
Is transferred to the computing device 1 (step), and a history data request flag is set (step).

In the computing device 1, the communication management unit 10c receives the system information from the computing device 2 (step), and sets the system information in the computing device 1 (step).

In the computing device 2, the history data processing unit 20a
, History data is collected and stored periodically. After the computing device 1 starts up, the history database 4 is first updated (step), and the history data request flag is checked (step).

Then, in the computing device 2, the system status monitoring control unit 20
When b confirms that the history data request flag is set, the history data processing unit 20a reads necessary history data from the history database 4 and gives it to the communication management unit 20c. Accordingly, the communication management unit 20c transfers the history data to the communication management unit 10c of the computing device 1 (Step). Next, the history data processing unit 20a of the computing device 2 resets the history data request flag after the transfer is completed (Step).

Upon receiving the history data from the communication management unit 20c (step), the computing device 1 transmits the history data to the history data processing unit 10c.
pass to a. The history data processing unit 10a of the computing device 1 updates the history database 3 based on the received history data (step).

Here, when there is a large amount of history data necessary for the transfer and all the transfer is not completed by the designated time of the collection and storage processing of the next calculation device 2, the history data processing unit 20a deletes the history data. Divided and transferred to the computing device 1,
The transfer of all data is completed within several cycles.

With this configuration, the history database 3 of the computing device 1 and the history database 4 of the computing device 2 become equivalent, and the migration is periodically performed by the respective history data processing units 10a and 20a. Data is collected and stored to ensure the continuity and identity of the contents of the history databases 3 and 4.

In the present embodiment, the description has been made on the assumption that the number of calculation processing devices is doubled, but a plurality of calculation processing devices may be used. In this case, the computer system is provided with a plurality of calculation processing devices for processing the database, and causes at least one of the calculation processing devices to be used as a normal system to execute a collection and storage process of history data.
In addition, the other processing units may be configured to execute processing as a standby system.

〔The invention's effect〕

As described above, according to the first aspect of the present invention, necessary history data is transmitted from the service processor in response to a request from the service processor of the standby system, and the transmission of the history data of the service processor is performed. Since transfer is performed using the timing when the collection and storage are completed, transfer omission does not occur. Further, the history data is transferred at the timing when the service system finishes the processing of the history data, so that the processing of the service system history data is also performed normally.

According to the first aspect of the present invention, when the requested history data is large and the transfer process is not completed within the time from the collection and storage of the history data to the next similar process, the calculation process of the regular system is performed. The apparatus divides this and performs a transfer process each time the collection and storage of the history data is completed. Therefore, there is no possibility that the regular processing device performs the collection and storage processing of the history data while transferring a large amount of history data, and there is no possibility that the continuity of the history data of the standby system is lost.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a computer system of the present invention, and FIG. 2 is a flowchart for explaining an embodiment of a data equalization method of the present invention. 1,2 ... Computing device, 3,4 ... History database, 10 ... Processing means, 11 ... Setting means (History data transfer request flag), 10a, 20a ... History data processing unit, 10b, 20b ... System status monitoring control unit, 10c, 20c ... Communication management unit.

Claims (1)

(57) [Claims] 1. A computer system comprising: a plurality of processing units for processing a database; at least one of the processing units being a regular system for periodically executing collection and storage of history data; In the data equalization method that keeps the contents of the database of each processing device equivalent in the computer system that executes the processing as described above, the calculation processing device that has started up from standby or offline to the standby system must be switched from the standby system to the standby system. Requesting the transfer of system information and requesting the transfer of history data. When there is a transfer request of the system information to be a standby system, the service processor transfers this system information to the request destination and the history data. When a transfer request is set, and the collection and storage of the history data for the When a transmission request is set, the history data is read from the database, and when the transmission data is the amount that can be transferred until the next collection and storage processing of the history data, the history data is sent to the request destination at one time, and the transfer is possible. If the amount exceeds the amount, the history data is divided and sent every time the collection and storage of the history data is completed.